The PEO relationship involves a contractual allocation and sharing of employer responsibilities between the PEO and the client; this shared employment relationship is called co-employment. When evaluating the employer role of either the PEO or the client, the facts and circumstances of each employer obligation should be examined separately, since neither party alone is responsible for performing all of the obligations of employment. Each party will be solely responsible for certain obligations of employment, while both parties will share responsibility for other obligations. When the facts and circumstances of a PEO arrangement are examined appropriately, both the PEO and the client will be found to be an employer for some purposes, but neither party will be found to be "the" employer for all purposes.
The client company provides the worksite employees with the tools, instrumentalities, and place of work. The PEO ensures that worksite employees are provided with a workplace that is safe, conducive to productivity, and operated in compliance with employment laws and regulations. In addition, the PEO provides worksite employees with workers' compensation insurance, unemployment insurance and a broad range of employee benefits programs.